<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <button @click="fn">切换显示隐藏</button>
    <h1 v-show="isShow">joker</h1>
  </div>

<script src="../js/vue.js"></script>
<script>
 var app = new Vue({
        el: "#app",
        data: {
          isShow: false,
          message: "",
        },
        methods:{
         fn(){
            this.isShow = !this.isShow;
         }
        }
      });

</script>

</body>
</html>